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Date:   Sat, 25 Jun 2022 11:25:01 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Bart Van Assche <bvanassche@acm.org>
Cc:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        linux-block@vger.kernel.org,
        Damien Le Moal <damien.lemoal@opensource.wdc.com>
Subject: Re: [PATCH v2 6/6] block/null_blk: Add support for pipelining
 zoned writes
Message-ID: <20220625092501.GA23615@lst.de>
References: <20220623232603.3751912-1-bvanassche@acm.org> <20220623232603.3751912-7-bvanassche@acm.org> <20220624060659.GA6494@lst.de> <31602226-611f-223e-ddd3-0c8ab780cb0b@acm.org>
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On Fri, Jun 24, 2022 at 09:45:54AM -0700, Bart Van Assche wrote:
> I have not yet seen any UFSHCI 4.0 implementation. The upstream UFSHCI 
> driver does not yet support it either.
>
> Hence the choice to add support to the null_blk driver for setting the 
> QUEUE_FLAG_PIPELINE_ZONED_WRITES flag.

Also I don't think UFS even supports zoned devices as is?  Either way
without an in-tree driver for actually useful and existing hardware
we should not add extra code to the block layer.